The blog of Xeno, a slightly mad scientist
In keeping with the theme of this blog, here’s a strange egg situation:
EGG WITHIN AN EGG: This extraordinarily rare situation occurs when an egg that is almost ready to be laid reverses engines into the reproductive tract, meeting up with another egg-in-progress.
It gets another layer of white/albumen and a new layer of shell before being laid.
The cause is not known.